US6243546B1 - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

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Publication number
US6243546B1
US6243546B1 US09/361,178 US36117899A US6243546B1 US 6243546 B1 US6243546 B1 US 6243546B1 US 36117899 A US36117899 A US 36117899A US 6243546 B1 US6243546 B1 US 6243546B1
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United States
Prior art keywords
forming apparatus
scanning unit
image forming
original
image
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Expired - Fee Related
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US09/361,178
Inventor
Yukio Watanabe
Shigemichi Hamano
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Canon Inc
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Canon Inc
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Assigned to CANON KABUSHIKI KAISHA reassignment CANON KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HAMANO, SHIGEMICHI, WATANABE, YUKIO
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00885—Power supply means, e.g. arrangements for the control of power supply to the apparatus or components thereof
    • H04N1/00888—Control thereof
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00885—Power supply means, e.g. arrangements for the control of power supply to the apparatus or components thereof
    • H04N1/00904—Arrangements for supplying power to different circuits or for supplying power at different levels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/047—Detection, control or error compensation of scanning velocity or position
    • H04N1/0473—Detection, control or error compensation of scanning velocity or position in subscanning direction, e.g. picture start or line-to-line synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00885—Power supply means, e.g. arrangements for the control of power supply to the apparatus or components thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/04—Scanning arrangements
    • H04N2201/047—Detection, control or error compensation of scanning velocity or position
    • H04N2201/04753—Control or error compensation of scanning position or velocity
    • H04N2201/04755—Control or error compensation of scanning position or velocity by controlling the position or movement of a scanning element or carriage, e.g. of a polygonal mirror, of a drive motor

Definitions

  • the present invention relates to an image forming apparatus such as a copying machine and the like.
  • a fixing device including a heat pressing roller has been used as a fixing means for fixing an image to a transfer sheet. Since the fixing device including such a heat pressing roller utilizes a heat source having great consumption of electricity such as a halogen heater, it is very difficult to reduce consumption of electricity of the entire image forming apparatus.
  • continuous copying operations are effected by using a copying machine having a fluorescent lamp as an illumination light source of an original scanning portion, since consumption of electricity becomes great during back scanning for returning an original scanning body from a scan finishing position to a home position, maximum consumption of electricity of the machine may not be suppressed within a desired range.
  • the reason is that it takes a long time for the fluorescent lamp to stabilize a light amount after the lamp is turned ON so that the fluorescent lamp cannot be turned OFF during the back scanning, and a shifting speed of the original scanning body in the back scanning is faster than in forward scanning, with the result that consumption of electricity of a drive motor during the back scanning becomes great.
  • the present invention aims to eliminate the above-mentioned conventional drawback, and an object of the present invention is to provide an image forming apparatus which can suppress consumption of electricity of the apparatus when a document scanning unit is shifted backwardly.
  • Another object of the present invention is to provide an image forming apparatus comprising a document scanning unit which can be shifted while illuminating an original and which is shifted backwardly at a speed faster than a speed when the document scanning unit is shifted forwardly to scan the original, an image fixing means for fixing an image on a recording material, and a control means for controlling an electric power supplied to the image fixing means, and the control means lowers the electric power supplied to the image fixing means when the document scanning unit is shifted backwardly.
  • FIG. 1 is a schematic view showing an entire construction of an image forming apparatus according to first and second embodiments of the present invention
  • FIG. 2 is a schematic view showing an entire construction of an image forming apparatus according to third and fourth embodiments of the present invention
  • FIG. 3 is a time chart showing an ON timing of a heater in the first embodiment
  • FIG. 4 is a time chart showing an ON timing of a heater in the second embodiment
  • FIG. 5 is a time chart showing an ON timing of a heater in the third embodiment
  • FIG. 6 is a time chart showing an ON timing of a heater in the fourth embodiment.
  • FIG. 7 is a view showing consumption of electric powers in the first to fourth embodiments of the present invention and in conventional cases.
  • FIG. 1 shows an example of an image forming apparatus according to the present invention.
  • An original is illuminated by a light source 2 (fluorescent lamp in this example), and light reflected from the original is converted into an image signal by a photo-electrical converting element such as CCD.
  • the image signal is appropriately altered by a reader controller 6 and then is sent to a printer portion 3 .
  • a photosensitive drum 7 is subjected to image exposure to form an electrostatic latent image.
  • the electrostatic latent image is visualized with toner by a developing unit 8 , and, thereafter, the visualized toner image is primarily transferred onto an intermediate transfer drum 9 .
  • the toner image is transferred onto a recording material at a secondary transferring station 10 , and the recording material on which the toner image was born is brought, by a transfer belt 11 , to a fixing device 4 , where the toner image is fixed to the recording material by heat and pressure.
  • the reader controller 6 sends an interruption signal to a controller 31 the printer portion 3 in synchronous with a back scanning operation for returning the light source 2 to an initial position for the original scanning.
  • controller 31 of the printer portion 3 on the interruption signal sent, a way for controlling a temperature of the fixing device 4 is altered.
  • the fixing device 4 comprises a fixing roller (upper roller having an outer diameter of 46 mm, a rubber thickness of 2.1 mm and a PFA tube having surface layer thickness of 50 ⁇ m) and a pressure roller (lower roller having an outer diameter of 46 mm, a rubber thickness of 2.3 mm and a PFA tube having surface layer thickness of 50 ⁇ m), and halogen heaters 5 (both 550 W) as heating sources are incorporated within the rollers.
  • a fixing roller upper roller having an outer diameter of 46 mm, a rubber thickness of 2.1 mm and a PFA tube having surface layer thickness of 50 ⁇ m
  • a pressure roller lower roller having an outer diameter of 46 mm, a rubber thickness of 2.3 mm and a PFA tube having surface layer thickness of 50 ⁇ m
  • halogen heaters 5 both 550 W
  • the light source After original scanning (forward scanning) for about two seconds, the light source is returned to the home position (back scanning) for about 0.5 second.
  • the consumption of electricity becomes greater in the back scanning than in the forward scanning by about 65 W.
  • the consumption of electricity of 550 W corresponding to one of heaters in the illustrated embodiment can be reduced.
  • the heaters 5 are turned ON alternately with short intervals.
  • the others are the same as those in the first embodiment.
  • FIG. 2 shows another example of an image forming apparatus according to the present invention.
  • An image is formed in the same manner as those in the first and second embodiments, except for the fact that the originals can automatically be exchanged by an original exchanging device 12 .
  • the signal is sent from the reader controller 6 to the printer portion 3 in synchronous with the exchange of original.
  • the signal is also in synchronous with the back scanning of the light source due to inherent feature of the image forming apparatus.
  • the printer portion 3 alters the temperature controlling method of the fixing device 4 .
  • the consumption of electricity of 550 W corresponding to one of heaters in the illustrated embodiment can be reduced.
  • timing of peak becomes that in the scanning peak of consumption of electricity can be reduced by 195 W.
  • an image is formed in the same manner as that in the third embodiment, except for the fact that the heaters 5 are turned ON alternately with short intervals as a way for altering temperature control of the fixing device 4 .
  • timing of peak becomes that in the scanning peak of consumption of electricity can be reduced by 195 W.
  • Results of the first to fourth embodiments are summarized in FIG. 7 .

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fixing For Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)

Abstract

An image forming apparatus has a document scanning unit which can be shifted while illuminating an original and which is shifted backwardly at a speed faster than a speed when said document scanning unit is shifted forwardly to scan the original, and a control unit which lowers the electric power supplied to an image fixing means when the document scanning unit is shifted backwardly.

Description

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an image forming apparatus such as a copying machine and the like.
2. Related Background Art
Conventionally, in image forming apparatuses such as copying machines, a fixing device including a heat pressing roller has been used as a fixing means for fixing an image to a transfer sheet. Since the fixing device including such a heat pressing roller utilizes a heat source having great consumption of electricity such as a halogen heater, it is very difficult to reduce consumption of electricity of the entire image forming apparatus.
Particularly, continuous copying operations are effected by using a copying machine having a fluorescent lamp as an illumination light source of an original scanning portion, since consumption of electricity becomes great during back scanning for returning an original scanning body from a scan finishing position to a home position, maximum consumption of electricity of the machine may not be suppressed within a desired range. The reason is that it takes a long time for the fluorescent lamp to stabilize a light amount after the lamp is turned ON so that the fluorescent lamp cannot be turned OFF during the back scanning, and a shifting speed of the original scanning body in the back scanning is faster than in forward scanning, with the result that consumption of electricity of a drive motor during the back scanning becomes great.
Due to such great consumption of electricity in the back scanning of the original scanning body, the consumption of electricity of the entire machine may not be suppressed within the desired range.
SUMMARY OF THE INVENTION
The present invention aims to eliminate the above-mentioned conventional drawback, and an object of the present invention is to provide an image forming apparatus which can suppress consumption of electricity of the apparatus when a document scanning unit is shifted backwardly.
Another object of the present invention is to provide an image forming apparatus comprising a document scanning unit which can be shifted while illuminating an original and which is shifted backwardly at a speed faster than a speed when the document scanning unit is shifted forwardly to scan the original, an image fixing means for fixing an image on a recording material, and a control means for controlling an electric power supplied to the image fixing means, and the control means lowers the electric power supplied to the image fixing means when the document scanning unit is shifted backwardly.
The other objects and features of the present invention will be apparent from the following detailed explanation referring to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic view showing an entire construction of an image forming apparatus according to first and second embodiments of the present invention;
FIG. 2 is a schematic view showing an entire construction of an image forming apparatus according to third and fourth embodiments of the present invention;
FIG. 3 is a time chart showing an ON timing of a heater in the first embodiment;
FIG. 4 is a time chart showing an ON timing of a heater in the second embodiment;
FIG. 5 is a time chart showing an ON timing of a heater in the third embodiment;
FIG. 6 is a time chart showing an ON timing of a heater in the fourth embodiment; and
FIG. 7 is a view showing consumption of electric powers in the first to fourth embodiments of the present invention and in conventional cases.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention will now be fully explained with reference to accompanying drawings.
First Embodiment
FIG. 1 shows an example of an image forming apparatus according to the present invention.
An original is illuminated by a light source 2 (fluorescent lamp in this example), and light reflected from the original is converted into an image signal by a photo-electrical converting element such as CCD. The image signal is appropriately altered by a reader controller 6 and then is sent to a printer portion 3.
In the printer portion 3, on the basis of the image signal sent from the reader controller 6, a photosensitive drum 7 is subjected to image exposure to form an electrostatic latent image.
The electrostatic latent image is visualized with toner by a developing unit 8, and, thereafter, the visualized toner image is primarily transferred onto an intermediate transfer drum 9.
Then, the toner image is transferred onto a recording material at a secondary transferring station 10, and the recording material on which the toner image was born is brought, by a transfer belt 11, to a fixing device 4, where the toner image is fixed to the recording material by heat and pressure.
In this case, the reader controller 6 sends an interruption signal to a controller 31 the printer portion 3 in synchronous with a back scanning operation for returning the light source 2 to an initial position for the original scanning.
In controller 31 of the printer portion 3, on the interruption signal sent, a way for controlling a temperature of the fixing device 4 is altered.
The fixing device 4 comprises a fixing roller (upper roller having an outer diameter of 46 mm, a rubber thickness of 2.1 mm and a PFA tube having surface layer thickness of 50 μm) and a pressure roller (lower roller having an outer diameter of 46 mm, a rubber thickness of 2.3 mm and a PFA tube having surface layer thickness of 50 μm), and halogen heaters 5 (both 550 W) as heating sources are incorporated within the rollers.
In the illustrated embodiment, as the way for controlling the temperature of the fixing device, a method in which only the heater of the upper roller among the heaters of the fixing device 4 is turned ON/OFF is used.
This is shown in FIG. 3.
After original scanning (forward scanning) for about two seconds, the light source is returned to the home position (back scanning) for about 0.5 second.
Since the speed of the back scanning is faster than the speed of the forward scanning by about four times, consumption of electricity of the original reading apparatus becomes maximum during the back scanning (since the fluorescent lamp cannot be turned OFF during the series of image forming operations, as mentioned above).
More specifically, the consumption of electricity becomes greater in the back scanning than in the forward scanning by about 65 W.
In this case, as shown in FIG. 3, by turning OFF only the upper heater, peak of consumption of electricity can be reduced.
More specifically, in the back scanning, the consumption of electricity of 550 W corresponding to one of heaters in the illustrated embodiment can be reduced.
Further, in comparison with the case where the lower heater is not turned OFF in the back scanning, since the peak of consumption of electricity becomes that in the scanning, maximum consumption of electricity can be reduced by 65 W.
When such fixing temperature control is effected, in the back scanning, heat amount applied to the fixing device is reduced to half.
However, in effect, since the time of back scanning is shorter than the time of forward scanning by about ¼ and the heat amounts of the fixing roller and the pressure roller, even if the heaters are not turned ON instantaneously, abrupt reduction in temperature does not occur, with the result that great influence is not affected to performance of the fixing device (fixing ability and fixing offset).
Second Embodiment
In a second embodiment of the present invention, as a way for altering temperature control of the fixing device 4, the heaters 5 are turned ON alternately with short intervals. The others are the same as those in the first embodiment.
This is shown in FIG. 4.
Also in this case, in the back scanning, the consumption of electricity of 550 W corresponding to one of heaters can be reduced.
Further, since timing of peak becomes that in the scanning, peak of consumption of electricity can be reduced by 65 W.
Third Embodiment
FIG. 2 shows another example of an image forming apparatus according to the present invention.
An image is formed in the same manner as those in the first and second embodiments, except for the fact that the originals can automatically be exchanged by an original exchanging device 12.
In this case, the signal is sent from the reader controller 6 to the printer portion 3 in synchronous with the exchange of original. The signal is also in synchronous with the back scanning of the light source due to inherent feature of the image forming apparatus.
In the exchange of original (in the back scanning), in addition to 65 W described in connection with the first embodiment, 130 W corresponding to the original exchanging device is added, so that consumption of electricity of about 195 W in total is increased in comparison with the forward scanning.
On the basis of the signal sent, the printer portion 3 alters the temperature controlling method of the fixing device 4.
In this example, as the altering method, only one of the heaters 5 of the fixing device 4 is turned ON.
This is shown in FIG. 5.
Thus, by turning ON only the upper heater in exchange of original, peak of consumption of electricity can be reduced.
More specifically, in the back scanning, the consumption of electricity of 550 W corresponding to one of heaters in the illustrated embodiment can be reduced.
Further, since timing of peak becomes that in the scanning, peak of consumption of electricity can be reduced by 195 W.
Fourth Embodiment
In a fourth embodiment of the present invention, an image is formed in the same manner as that in the third embodiment, except for the fact that the heaters 5 are turned ON alternately with short intervals as a way for altering temperature control of the fixing device 4.
This is shown in FIG. 6.
Also in this case, in the back scanning, the consumption of electricity of 550 W corresponding to one of heaters can be reduced.
Further, since timing of peak becomes that in the scanning, peak of consumption of electricity can be reduced by 195 W.
Results of the first to fourth embodiments are summarized in FIG. 7.
As mentioned above, in response to the signal from the reader controller in synchronous with the back scanning of the original reading device, by altering the turning ON of the heaters of the fixing device of the printer, peak of consumption of electricity of the image forming apparatus can be reduced.
Furthermore, in response to the signal from the reader controller in synchronous with the exchange of original of the original exchanging device, by altering the turning ON of the heaters of the fixing device of the printer, peak of consumption of electricity of the image forming apparatus can be reduced.
The present invention is not limited to the above-mentioned embodiments, but various alterations can be made within the scope of the invention.

Claims (5)

What is claimed is:
1. An image forming apparatus comprising:
a document scanning unit for scanning an original, wherein said document scanning unit can be shifted while illuminating an original and is shifted backwardly at a speed faster than a speed faster than a speed when said document scanning unit is shifted forwardly to scan the original;
image fixing means for fixing an image on a recording material; and
control means for controlling an electric power supplied to said image fixing means;
wherein said control means lowers the electric power supplied to said image fixing means when said document scanning unit is shifted backwardly.
2. An image forming apparatus according to claim 1, wherein said document scanning unit comprises a light source for illuminating the original, and when said document scanning unit scans a plurality of originals, said light source is turned ON also in the backward shifting.
3. An image forming apparatus according to claim 2, wherein said light source comprises a fluorescent lamp.
4. An image forming apparatus according to claim 1, wherein said image fixing means comprises a plurality of heaters, and said control means lowers consumption of electricity of at least one of said heaters when said document scanning unit is shifted backwardly.
5. An image forming apparatus according to claim 1, wherein said image fixing means comprises a plurality of heaters, and said control means turns ON said plurality of said heaters successively when said document scanning unit is shifted backwardly.
US09/361,178 1998-07-30 1999-07-27 Image forming apparatus Expired - Fee Related US6243546B1 (en)

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JP10-215691 1998-07-30
JP10215691A JP2000047537A (en) 1998-07-30 1998-07-30 Image forming device

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030161647A1 (en) * 2002-02-28 2003-08-28 Masanori Okuda Image forming apparatus
US20070274734A1 (en) * 2006-05-24 2007-11-29 Kabushiki Kaisha Toshiba Fixing device for color image forming apparatus and control method

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5467177A (en) * 1993-09-09 1995-11-14 Fujitsu Limited Fixing method for printing machine and electrophotoghraphic printing machine
US5651540A (en) 1992-07-23 1997-07-29 Canon Kabushiki Kaisha Sheet supply device with stacking reference guide
US5742870A (en) * 1995-07-13 1998-04-21 Samsung Electronics Co., Ltd. Method for regulating temperature of a fixing unit in an electrophotographic system
US5819149A (en) 1995-11-01 1998-10-06 Canon Kabushiki Kaisha Image forming apparatus preventing change of size of image
US5819134A (en) * 1995-06-30 1998-10-06 Canon Kabushiki Kaisha Fixing apparatus having a temperature control system for a plurality of heaters
US5903799A (en) * 1995-05-31 1999-05-11 Canon Kabushiki Kaisha Image heating apparatus with energization control
US6008829A (en) * 1996-06-04 1999-12-28 Canon Kabushiki Kaisha Control apparatus for fixing unit having plural heaters
US6011938A (en) * 1997-07-24 2000-01-04 Sharp Kabushiki Kaisha Fixing device in image forming device
US6032017A (en) * 1999-04-09 2000-02-29 Hewlett-Packard Company Fixing device using an adjustable heater to reduce contamination on media

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5651540A (en) 1992-07-23 1997-07-29 Canon Kabushiki Kaisha Sheet supply device with stacking reference guide
US5467177A (en) * 1993-09-09 1995-11-14 Fujitsu Limited Fixing method for printing machine and electrophotoghraphic printing machine
US5903799A (en) * 1995-05-31 1999-05-11 Canon Kabushiki Kaisha Image heating apparatus with energization control
US5819134A (en) * 1995-06-30 1998-10-06 Canon Kabushiki Kaisha Fixing apparatus having a temperature control system for a plurality of heaters
US5742870A (en) * 1995-07-13 1998-04-21 Samsung Electronics Co., Ltd. Method for regulating temperature of a fixing unit in an electrophotographic system
US5819149A (en) 1995-11-01 1998-10-06 Canon Kabushiki Kaisha Image forming apparatus preventing change of size of image
US6008829A (en) * 1996-06-04 1999-12-28 Canon Kabushiki Kaisha Control apparatus for fixing unit having plural heaters
US6011938A (en) * 1997-07-24 2000-01-04 Sharp Kabushiki Kaisha Fixing device in image forming device
US6032017A (en) * 1999-04-09 2000-02-29 Hewlett-Packard Company Fixing device using an adjustable heater to reduce contamination on media

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030161647A1 (en) * 2002-02-28 2003-08-28 Masanori Okuda Image forming apparatus
US6819889B2 (en) * 2002-02-28 2004-11-16 Oki Data Corporation Image forming apparatus having power saving mechanism
US20070274734A1 (en) * 2006-05-24 2007-11-29 Kabushiki Kaisha Toshiba Fixing device for color image forming apparatus and control method
US7428389B2 (en) * 2006-05-24 2008-09-23 Kabushiki Kaisha Toshiba Fixing device for color image forming apparatus and control method
US20090047033A1 (en) * 2006-05-24 2009-02-19 Kabushiki Kaisha Toshiba Fixing device for color image forming apparatus and control method
US7676168B2 (en) 2006-05-24 2010-03-09 Kabushiki Kaisha Toshiba Fixing device for color image forming apparatus and control method
US20100111555A1 (en) * 2006-05-24 2010-05-06 Kabushiki Kaisha Toshiba Fixing device for color image forming apparatus and control method

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